40 U.S. NATIONAL MUSEUM BULLETIN 239 



ammon, Planorbis: 1855, PBSNH, vol. 5, p. 129 (Cienaga Grande, 

 the Colorado Low Desert [Imperial Co., Calif.], T. H. Webb and 

 W. P. Blake), axis % ad 1, diam. % ad }{ in.; 1855, in Blake, Appen- 

 dix, Prel. Geol. Rep., R.R. Route to Pacific, p. 23; 1856, in William- 

 son, Rep. Explor. California for R.R. Routes, vol. 5, pt. 2, Appen- 

 dix, art. 3, p. 331, pi. 11, figs. 12-18; 1862, Otia Conch., p. 216. 

 Lectotype, here selected, USNM 13392 [cataloged as "Invert. 

 Fossile," now with recent collection], specimen shown in fig. 16; 60 

 paratypes MCZ 169040 ex NYSM 311. 



Amnicola Gouldjand Haldeman, new genus: 1841, Invert. Massa- 

 chusetts p. 228. Type species: Paludina porata Say, by mono- 

 typy. 



amoena, Neritina: 1847, PBSNH, vol. 2, p. 238 (hab.?), axis 

 % 6 , lat. % in.; 1852, USEE, vol. 12, p. 159, pi. 11, fig. 192,a; 1862, 

 Otia Conch., p. 49. Syntype USNM 5592; 4 syn types MCZ 

 169038 ex NYSM 111, original no. A 4407, all larger than the 

 measured type; 2 syn types MCZ ex BSNH 3655. 



amoenus, Trochus [Gibbula]: 1849, PBSNH, vol. 3, p. 107 (Feejee 

 [Fiji] Islands), diam. % , alt. Ko in.; 1852, USEE, vol. 12, p. 187, 

 pi. 23, fig. 218,a-c; 1862, Otia. Conch., pp. 58, 245. Presumed holo- 

 type USNM 5618 agrees with the figure and was the only type 

 located; 20 paratypes MCZ 169039 ex NYSM 123, original no. A 

 2918. 



amplexa, Clathurella: 1860 PBSNH, vol. 7, p. 338 (Simon's Bay 

 [Cape of Good Hope], 12 fathoms, sandy bottom, W. Stimpson), 

 axis 9, diam. 3 mm.; 1862 Otia Conch., p. 135. Holotype USNM 

 24093, original no. 217, figured by Bartsch, 1915, USNM Bull. 91, 

 p. 30, pi. 2, fig. 6. NPEE. 



amussitatus, Turbo Plate 17, fig. 3 



1861, PBSNH, vol. 8, p. 22 (hab. ? [Shimoda, Japan]), axis 12 mm.; 



1862, Otia Conch., p. 160. Lectotype, here selected, MCZ 216592 

 ex Smithsonian Inst, (printed label); 2 paratypes MCZ 87864 ex 

 BSNH 5577. 



anceps, Helix (Caracolla) Plate 37, fig. 2 



1843, PBSNH, vol. 1, p. 139 ([Tavoy,] British Burmah [Burma], 

 F. Mason), diam. Ko, alt. % Q in.; 1844, BJNH, vol. 4, p. 454, pi. 25, 

 fig. 4; 1862, Otia Conch., p. 170. Lectotype, here selected, MCZ 

 169041 ex NYSM 254, original no. A 569 and 10 paratypes MCZ 

 225231 from same NYSM lot; 2 paratypes MCZ 87869 ex BSNH; 

 paratype MCZ 11176 ex J. G. Anthony. 



anguina, Helix [Corilla] Plate 38, fig. 8 



1847, PBSNH, vol. 2, p. 218 (Manko, near Newville, [Province of] 

 Tavoy [Burma], Mrs. Vinton), diam. 1, alt. y 4 in.; 1862, Otia Conch., 

 p. 200. Lectotype, here selected, MCZ 169042 ex NYSM 257, 



